Question

resolve o sistema 3y+x=9y+4/3x=6

Answer 1

3y + x = 9
y + 4/3x = 6   .(-3)  
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3y + x = 9
-3y - 4x = -18
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-3x=-9
x = 9/3
x = 3

3y + x = 9
3y + 3 = 9
3y = 9 - 3
3y = 6
y = 6/3
y = 2